Implement CHIP-8 Instructions: Conditional

[fokoid]

• [x] 0x3XNN Skips the next instruction if VX equals NN (usually the next instruction is a jump to skip a code block). (if (Vx == NN))
• [x] 0x4XNN Skips the next instruction if VX does not equal NN (usually the next instruction is a jump to skip a code block). (if (Vx != NN))
• [x] 0x5XY0 Skips the next instruction if VX equals VY (usually the next instruction is a jump to skip a code block). (if (Vx == Vy))
• [x] 0x9XY0 Skips the next instruction if VX does not equal VY. (Usually the next instruction is a jump to skip a code block); (if (Vx != Vy))

Pseudocode and descriptions were sourced from the CHIP-8 Wikipedia article and are licensed under the Creative Commons Attribution-ShareAlike License 3.0.